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/* |
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protocol.C -- handle the protocol, encryption, handshaking etc. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "config.h" |
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|
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#include <list> |
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|
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#include <cstdlib> |
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#include <cstring> |
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#include <cstdio> |
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|
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/poll.h> |
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#include <sys/wait.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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#include <errno.h> |
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#include <time.h> |
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#include <unistd.h> |
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|
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#include <openssl/rand.h> |
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#include <openssl/hmac.h> |
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#include <openssl/evp.h> |
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#include <openssl/rsa.h> |
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#include <openssl/err.h> |
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|
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extern "C" { |
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# include "lzf/lzf.h" |
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} |
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|
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#include "gettext.h" |
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#include "pidfile.h" |
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|
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#include "conf.h" |
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#include "slog.h" |
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#include "device.h" |
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#include "protocol.h" |
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|
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#if !HAVE_RAND_PSEUDO_BYTES |
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# define RAND_pseudo_bytes RAND_bytes |
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#endif |
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|
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static time_t next_timecheck; |
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|
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#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
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|
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static const rsachallenge & |
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challenge_bytes () |
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{ |
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static rsachallenge challenge; |
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static double challenge_ttl; // time this challenge needs to be recreated |
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|
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if (NOW > challenge_ttl) |
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{ |
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RAND_bytes ((unsigned char *)&challenge, sizeof (challenge)); |
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challenge_ttl = NOW + CHALLENGE_TTL; |
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} |
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|
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return challenge; |
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} |
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|
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// caching of rsa operations really helps slow computers |
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struct rsa_entry { |
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tstamp expire; |
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rsachallenge chg; |
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RSA *key; // which key |
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rsaencrdata encr; |
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|
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rsa_entry () |
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{ |
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expire = NOW + CHALLENGE_TTL; |
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} |
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}; |
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|
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struct rsa_cache : list<rsa_entry> |
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{ |
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void cleaner_cb (tstamp &ts); time_watcher cleaner; |
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|
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const rsaencrdata *public_encrypt (RSA *key, const rsachallenge &chg) |
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{ |
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for (iterator i = begin (); i != end (); ++i) |
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{ |
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if (i->key == key && !memcmp (&chg, &i->chg, sizeof chg)) |
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return &i->encr; |
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} |
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|
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if (cleaner.at < NOW) |
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cleaner.start (NOW + CHALLENGE_TTL); |
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|
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resize (size () + 1); |
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rsa_entry *e = &(*rbegin ()); |
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|
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e->key = key; |
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memcpy (&e->chg, &chg, sizeof chg); |
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|
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if (0 > RSA_public_encrypt (sizeof chg, |
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(unsigned char *)&chg, (unsigned char *)&e->encr, |
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key, RSA_PKCS1_OAEP_PADDING)) |
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fatal ("RSA_public_encrypt error"); |
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|
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return &e->encr; |
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} |
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|
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const rsachallenge *private_decrypt (RSA *key, const rsaencrdata &encr) |
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{ |
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for (iterator i = begin (); i != end (); ++i) |
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if (i->key == key && !memcmp (&encr, &i->encr, sizeof encr)) |
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return &i->chg; |
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|
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if (cleaner.at < NOW) |
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cleaner.start (NOW + CHALLENGE_TTL); |
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|
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resize (size () + 1); |
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rsa_entry *e = &(*rbegin ()); |
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|
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e->key = key; |
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memcpy (&e->encr, &encr, sizeof encr); |
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|
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if (0 > RSA_private_decrypt (sizeof encr, |
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(unsigned char *)&encr, (unsigned char *)&e->chg, |
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key, RSA_PKCS1_OAEP_PADDING)) |
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{ |
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pop_back (); |
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return 0; |
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} |
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|
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return &e->chg; |
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} |
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|
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rsa_cache () |
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: cleaner (this, &rsa_cache::cleaner_cb) |
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{ } |
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|
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} rsa_cache; |
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|
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void rsa_cache::cleaner_cb (tstamp &ts) |
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{ |
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if (empty ()) |
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ts = TSTAMP_CANCEL; |
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else |
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{ |
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ts = NOW + 3; |
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for (iterator i = begin (); i != end (); ) |
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{ |
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if (i->expire >= NOW) |
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i = erase (i); |
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else |
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++i; |
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} |
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} |
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} |
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|
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// run a script. yes, it's a template function. yes, c++ |
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// is not a functional language. yes, this suxx. |
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template<class owner> |
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static void |
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run_script (owner *obj, const char *(owner::*setup)(), bool wait) |
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{ |
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int pid; |
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|
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if ((pid = fork ()) == 0) |
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{ |
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char *filename; |
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asprintf (&filename, "%s/%s", confbase, (obj->*setup) ()); |
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execl (filename, filename, (char *) 0); |
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exit (255); |
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} |
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else if (pid > 0) |
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{ |
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if (wait) |
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{ |
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waitpid (pid, 0, 0); |
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/* TODO: check status */ |
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} |
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} |
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} |
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|
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// xor the socket address into the challenge to ensure different challenges |
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// per host. we could rely on the OAEP padding, but this doesn't hurt. |
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void |
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xor_sa (rsachallenge &k, SOCKADDR *sa) |
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{ |
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((u32 *) k)[(CHG_CIPHER_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
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((u16 *) k)[(CHG_CIPHER_KEY + 4) / 2] ^= sa->sin_port; |
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((u32 *) k)[(CHG_HMAC_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
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((u16 *) k)[(CHG_HMAC_KEY + 4) / 2] ^= sa->sin_port; |
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} |
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|
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struct crypto_ctx |
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{ |
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EVP_CIPHER_CTX cctx; |
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HMAC_CTX hctx; |
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|
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crypto_ctx (const rsachallenge &challenge, int enc); |
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~crypto_ctx (); |
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}; |
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|
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crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
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{ |
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EVP_CIPHER_CTX_init (&cctx); |
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EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
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HMAC_CTX_init (&hctx); |
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HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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} |
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|
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crypto_ctx::~crypto_ctx () |
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{ |
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EVP_CIPHER_CTX_cleanup (&cctx); |
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HMAC_CTX_cleanup (&hctx); |
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} |
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|
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////////////////////////////////////////////////////////////////////////////// |
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|
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void pkt_queue::put (tap_packet *p) |
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{ |
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if (queue[i]) |
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{ |
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delete queue[i]; |
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j = (j + 1) % QUEUEDEPTH; |
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} |
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|
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queue[i] = p; |
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|
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i = (i + 1) % QUEUEDEPTH; |
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} |
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|
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tap_packet *pkt_queue::get () |
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{ |
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tap_packet *p = queue[j]; |
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|
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if (p) |
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{ |
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queue[j] = 0; |
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j = (j + 1) % QUEUEDEPTH; |
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} |
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|
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return p; |
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} |
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|
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pkt_queue::pkt_queue () |
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{ |
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memset (queue, 0, sizeof (queue)); |
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i = 0; |
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j = 0; |
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} |
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|
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pkt_queue::~pkt_queue () |
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{ |
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for (i = QUEUEDEPTH; --i > 0; ) |
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delete queue[i]; |
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} |
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|
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// only do action once every x seconds per host. |
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// currently this is quite a slow implementation, |
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// but suffices for normal operation. |
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struct u32_rate_limiter : private map<u32, tstamp> |
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{ |
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tstamp every; |
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|
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bool can (u32 host); |
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|
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u32_rate_limiter (tstamp every = 1) |
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{ |
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this->every = every; |
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} |
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}; |
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|
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struct net_rate_limiter : u32_rate_limiter |
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{ |
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bool can (SOCKADDR *sa) { return u32_rate_limiter::can((u32)sa->sin_addr.s_addr); } |
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bool can (sockinfo &si) { return u32_rate_limiter::can((u32)si.host); } |
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|
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net_rate_limiter (tstamp every) : u32_rate_limiter (every) {} |
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}; |
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|
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bool u32_rate_limiter::can (u32 host) |
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{ |
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iterator i; |
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|
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for (i = begin (); i != end (); ) |
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if (i->second <= NOW) |
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{ |
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erase (i); |
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i = begin (); |
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} |
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else |
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++i; |
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|
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i = find (host); |
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|
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if (i != end ()) |
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return false; |
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|
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insert (value_type (host, NOW + every)); |
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|
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return true; |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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static void next_wakeup (time_t next) |
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{ |
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if (next_timecheck > next) |
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next_timecheck = next; |
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} |
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|
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static unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
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|
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struct hmac_packet:net_packet |
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{ |
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u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere |
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|
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void hmac_set (crypto_ctx * ctx); |
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bool hmac_chk (crypto_ctx * ctx); |
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|
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private: |
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void hmac_gen (crypto_ctx * ctx) |
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{ |
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unsigned int xlen; |
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HMAC_CTX *hctx = &ctx->hctx; |
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|
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HMAC_Init_ex (hctx, 0, 0, 0, 0); |
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HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
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len - sizeof (hmac_packet)); |
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HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
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} |
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}; |
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|
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void |
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hmac_packet::hmac_set (crypto_ctx * ctx) |
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{ |
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hmac_gen (ctx); |
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|
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memcpy (hmac, hmac_digest, HMACLENGTH); |
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} |
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|
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bool |
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hmac_packet::hmac_chk (crypto_ctx * ctx) |
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{ |
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hmac_gen (ctx); |
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|
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return !memcmp (hmac, hmac_digest, HMACLENGTH); |
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} |
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|
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struct vpn_packet : hmac_packet |
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{ |
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enum ptype |
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{ |
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PT_RESET = 0, |
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PT_DATA_UNCOMPRESSED, |
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PT_DATA_COMPRESSED, |
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PT_PING, PT_PONG, // wasting namespace space? ;) |
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PT_AUTH, // authentification |
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PT_CONNECT_REQ, // want other host to contact me |
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PT_CONNECT_INFO, // request connection to some node |
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PT_REKEY, // rekeying (not yet implemented) |
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PT_MAX |
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}; |
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|
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u8 type; |
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u8 srcdst, src1, dst1; |
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|
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void set_hdr (ptype type, unsigned int dst); |
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|
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unsigned int src () |
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{ |
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return src1 | ((srcdst >> 4) << 8); |
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} |
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|
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unsigned int dst () |
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{ |
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return dst1 | ((srcdst & 0xf) << 8); |
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} |
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|
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ptype typ () |
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{ |
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return (ptype) type; |
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} |
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}; |
396 |
|
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void vpn_packet::set_hdr (ptype type, unsigned int dst) |
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{ |
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this->type = type; |
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|
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int src = THISNODE->id; |
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|
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src1 = src; |
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srcdst = ((src >> 8) << 4) | (dst >> 8); |
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dst1 = dst; |
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} |
407 |
|
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#define MAXVPNDATA (MAX_MTU - 6 - 6) |
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#define DATAHDR (sizeof (u32) + RAND_SIZE) |
410 |
|
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struct vpndata_packet:vpn_packet |
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{ |
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u8 data[MAXVPNDATA + DATAHDR]; // seqno |
414 |
|
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void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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tap_packet *unpack (connection *conn, u32 &seqno); |
417 |
private: |
418 |
|
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const u32 data_hdr_size () const |
420 |
{ |
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return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
422 |
} |
423 |
}; |
424 |
|
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void |
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vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
427 |
{ |
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EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
429 |
int outl = 0, outl2; |
430 |
ptype type = PT_DATA_UNCOMPRESSED; |
431 |
|
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#if ENABLE_COMPRESSION |
433 |
u8 cdata[MAX_MTU]; |
434 |
u32 cl; |
435 |
|
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cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
437 |
if (cl) |
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{ |
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type = PT_DATA_COMPRESSED; |
440 |
d = cdata; |
441 |
l = cl + 2; |
442 |
|
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d[0] = cl >> 8; |
444 |
d[1] = cl; |
445 |
} |
446 |
#endif |
447 |
|
448 |
EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
449 |
|
450 |
struct { |
451 |
#if RAND_SIZE |
452 |
u8 rnd[RAND_SIZE]; |
453 |
#endif |
454 |
u32 seqno; |
455 |
} datahdr; |
456 |
|
457 |
datahdr.seqno = ntohl (seqno); |
458 |
#if RAND_SIZE |
459 |
RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
460 |
#endif |
461 |
|
462 |
EVP_EncryptUpdate (cctx, |
463 |
(unsigned char *) data + outl, &outl2, |
464 |
(unsigned char *) &datahdr, DATAHDR); |
465 |
outl += outl2; |
466 |
|
467 |
EVP_EncryptUpdate (cctx, |
468 |
(unsigned char *) data + outl, &outl2, |
469 |
(unsigned char *) d, l); |
470 |
outl += outl2; |
471 |
|
472 |
EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
473 |
outl += outl2; |
474 |
|
475 |
len = outl + data_hdr_size (); |
476 |
|
477 |
set_hdr (type, dst); |
478 |
|
479 |
hmac_set (conn->octx); |
480 |
} |
481 |
|
482 |
tap_packet * |
483 |
vpndata_packet::unpack (connection *conn, u32 &seqno) |
484 |
{ |
485 |
EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
486 |
int outl = 0, outl2; |
487 |
tap_packet *p = new tap_packet; |
488 |
u8 *d; |
489 |
u32 l = len - data_hdr_size (); |
490 |
|
491 |
EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
492 |
|
493 |
#if ENABLE_COMPRESSION |
494 |
u8 cdata[MAX_MTU]; |
495 |
|
496 |
if (type == PT_DATA_COMPRESSED) |
497 |
d = cdata; |
498 |
else |
499 |
#endif |
500 |
d = &(*p)[6 + 6 - DATAHDR]; |
501 |
|
502 |
/* this overwrites part of the src mac, but we fix that later */ |
503 |
EVP_DecryptUpdate (cctx, |
504 |
d, &outl2, |
505 |
(unsigned char *)&data, len - data_hdr_size ()); |
506 |
outl += outl2; |
507 |
|
508 |
EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
509 |
outl += outl2; |
510 |
|
511 |
seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
512 |
|
513 |
id2mac (dst () ? dst() : THISNODE->id, p->dst); |
514 |
id2mac (src (), p->src); |
515 |
|
516 |
#if ENABLE_COMPRESSION |
517 |
if (type == PT_DATA_COMPRESSED) |
518 |
{ |
519 |
u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
520 |
p->len = lzf_decompress (d + DATAHDR + 2, cl, &(*p)[6 + 6], MAX_MTU) + 6 + 6; |
521 |
} |
522 |
else |
523 |
p->len = outl + (6 + 6 - DATAHDR); |
524 |
#endif |
525 |
|
526 |
return p; |
527 |
} |
528 |
|
529 |
struct ping_packet : vpn_packet |
530 |
{ |
531 |
void setup (int dst, ptype type) |
532 |
{ |
533 |
set_hdr (type, dst); |
534 |
len = sizeof (*this) - sizeof (net_packet); |
535 |
} |
536 |
}; |
537 |
|
538 |
struct config_packet : vpn_packet |
539 |
{ |
540 |
// actually, hmaclen cannot be checked because the hmac |
541 |
// field comes before this data, so peers with other |
542 |
// hmacs simply will not work. |
543 |
u8 prot_major, prot_minor, randsize, hmaclen; |
544 |
u8 flags, challengelen, pad2, pad3; |
545 |
u32 cipher_nid; |
546 |
u32 digest_nid; |
547 |
|
548 |
const u8 curflags () const |
549 |
{ |
550 |
return 0x80 |
551 |
| (ENABLE_COMPRESSION ? 0x01 : 0x00); |
552 |
} |
553 |
|
554 |
void setup (ptype type, int dst) |
555 |
{ |
556 |
prot_major = PROTOCOL_MAJOR; |
557 |
prot_minor = PROTOCOL_MINOR; |
558 |
randsize = RAND_SIZE; |
559 |
hmaclen = HMACLENGTH; |
560 |
flags = curflags (); |
561 |
challengelen = sizeof (rsachallenge); |
562 |
|
563 |
cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
564 |
digest_nid = htonl (EVP_MD_type (DIGEST)); |
565 |
|
566 |
len = sizeof (*this) - sizeof (net_packet); |
567 |
set_hdr (type, dst); |
568 |
} |
569 |
|
570 |
bool chk_config () |
571 |
{ |
572 |
return prot_major == PROTOCOL_MAJOR |
573 |
&& randsize == RAND_SIZE |
574 |
&& hmaclen == HMACLENGTH |
575 |
&& flags == curflags () |
576 |
&& challengelen == sizeof (rsachallenge) |
577 |
&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
578 |
&& digest_nid == htonl (EVP_MD_type (DIGEST)); |
579 |
} |
580 |
}; |
581 |
|
582 |
struct auth_packet : config_packet |
583 |
{ |
584 |
char magic[8]; |
585 |
u8 subtype; |
586 |
u8 pad1, pad2; |
587 |
rsaencrdata challenge; |
588 |
|
589 |
auth_packet (int dst, auth_subtype stype) |
590 |
{ |
591 |
config_packet::setup (PT_AUTH, dst); |
592 |
subtype = stype; |
593 |
len = sizeof (*this) - sizeof (net_packet); |
594 |
strncpy (magic, MAGIC, 8); |
595 |
} |
596 |
}; |
597 |
|
598 |
struct connect_req_packet : vpn_packet |
599 |
{ |
600 |
u8 id; |
601 |
u8 pad1, pad2, pad3; |
602 |
|
603 |
connect_req_packet (int dst, int id) |
604 |
{ |
605 |
this->id = id; |
606 |
set_hdr (PT_CONNECT_REQ, dst); |
607 |
len = sizeof (*this) - sizeof (net_packet); |
608 |
} |
609 |
}; |
610 |
|
611 |
struct connect_info_packet : vpn_packet |
612 |
{ |
613 |
u8 id; |
614 |
u8 pad1, pad2, pad3; |
615 |
sockinfo si; |
616 |
|
617 |
connect_info_packet (int dst, int id, sockinfo &si) |
618 |
{ |
619 |
this->id = id; |
620 |
this->si = si; |
621 |
set_hdr (PT_CONNECT_INFO, dst); |
622 |
len = sizeof (*this) - sizeof (net_packet); |
623 |
} |
624 |
}; |
625 |
|
626 |
///////////////////////////////////////////////////////////////////////////// |
627 |
|
628 |
void |
629 |
fill_sa (SOCKADDR *sa, conf_node *conf) |
630 |
{ |
631 |
sa->sin_family = AF_INET; |
632 |
sa->sin_port = htons (conf->port); |
633 |
sa->sin_addr.s_addr = 0; |
634 |
|
635 |
if (conf->hostname) |
636 |
{ |
637 |
struct hostent *he = gethostbyname (conf->hostname); |
638 |
|
639 |
if (he |
640 |
&& he->h_addrtype == AF_INET && he->h_length == 4 && he->h_addr_list[0]) |
641 |
{ |
642 |
//sa->sin_family = he->h_addrtype; |
643 |
memcpy (&sa->sin_addr, he->h_addr_list[0], 4); |
644 |
} |
645 |
else |
646 |
slog (L_NOTICE, _("unable to resolve host '%s'"), conf->hostname); |
647 |
} |
648 |
} |
649 |
|
650 |
void |
651 |
connection::reset_dstaddr () |
652 |
{ |
653 |
fill_sa (&sa, conf); |
654 |
} |
655 |
|
656 |
void |
657 |
connection::send_ping (SOCKADDR *dsa, u8 pong) |
658 |
{ |
659 |
ping_packet *pkt = new ping_packet; |
660 |
|
661 |
pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
662 |
vpn->send_vpn_packet (pkt, dsa, IPTOS_LOWDELAY); |
663 |
|
664 |
delete pkt; |
665 |
} |
666 |
|
667 |
void |
668 |
connection::send_reset (SOCKADDR *dsa) |
669 |
{ |
670 |
static net_rate_limiter limiter(1); |
671 |
|
672 |
if (limiter.can (dsa) && connectmode != conf_node::C_DISABLED) |
673 |
{ |
674 |
config_packet *pkt = new config_packet; |
675 |
|
676 |
pkt->setup (vpn_packet::PT_RESET, conf->id); |
677 |
vpn->send_vpn_packet (pkt, dsa, IPTOS_MINCOST); |
678 |
|
679 |
delete pkt; |
680 |
} |
681 |
} |
682 |
|
683 |
static rsachallenge * |
684 |
gen_challenge (u32 seqrand, SOCKADDR *sa) |
685 |
{ |
686 |
static rsachallenge k; |
687 |
|
688 |
memcpy (&k, &challenge_bytes (), sizeof (k)); |
689 |
*(u32 *)&k[CHG_SEQNO] ^= seqrand; |
690 |
xor_sa (k, sa); |
691 |
|
692 |
return &k; |
693 |
} |
694 |
|
695 |
void |
696 |
connection::send_auth (auth_subtype subtype, SOCKADDR *sa, const rsachallenge *k) |
697 |
{ |
698 |
static net_rate_limiter limiter(0.2); |
699 |
|
700 |
if (subtype != AUTH_INIT || limiter.can (sa)) |
701 |
{ |
702 |
if (!k) |
703 |
k = gen_challenge (seqrand, sa); |
704 |
|
705 |
auth_packet *pkt = new auth_packet (conf->id, subtype); |
706 |
|
707 |
memcpy (pkt->challenge, rsa_cache.public_encrypt (conf->rsa_key, *k), sizeof (rsaencrdata)); |
708 |
|
709 |
slog (L_TRACE, ">>%d PT_AUTH(%d) [%s]", conf->id, subtype, (const char *)sockinfo (sa)); |
710 |
|
711 |
vpn->send_vpn_packet (pkt, sa, IPTOS_RELIABILITY); |
712 |
|
713 |
delete pkt; |
714 |
} |
715 |
} |
716 |
|
717 |
void |
718 |
connection::establish_connection_cb (tstamp &ts) |
719 |
{ |
720 |
if (ictx || conf == THISNODE || connectmode == conf_node::C_NEVER) |
721 |
ts = TSTAMP_CANCEL; |
722 |
else if (ts <= NOW) |
723 |
{ |
724 |
double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.25; |
725 |
|
726 |
if (retry_int < 3600 * 8) |
727 |
retry_cnt++; |
728 |
|
729 |
ts = NOW + retry_int; |
730 |
|
731 |
if (conf->hostname) |
732 |
{ |
733 |
reset_dstaddr (); |
734 |
if (sa.sin_addr.s_addr) |
735 |
if (retry_cnt < 4) |
736 |
send_auth (AUTH_INIT, &sa); |
737 |
else |
738 |
send_ping (&sa, 0); |
739 |
} |
740 |
else |
741 |
vpn->connect_request (conf->id); |
742 |
} |
743 |
} |
744 |
|
745 |
void |
746 |
connection::reset_connection () |
747 |
{ |
748 |
if (ictx && octx) |
749 |
{ |
750 |
slog (L_INFO, _("connection to %d (%s) lost"), conf->id, conf->nodename); |
751 |
|
752 |
if (::conf.script_node_down) |
753 |
run_script (this, &connection::script_node_down, false); |
754 |
} |
755 |
|
756 |
delete ictx; ictx = 0; |
757 |
delete octx; octx = 0; |
758 |
|
759 |
RAND_bytes ((unsigned char *)&seqrand, sizeof (u32)); |
760 |
|
761 |
sa.sin_port = 0; |
762 |
sa.sin_addr.s_addr = 0; |
763 |
|
764 |
last_activity = 0; |
765 |
|
766 |
rekey.reset (); |
767 |
keepalive.reset (); |
768 |
establish_connection.reset (); |
769 |
} |
770 |
|
771 |
void |
772 |
connection::shutdown () |
773 |
{ |
774 |
if (ictx && octx) |
775 |
send_reset (&sa); |
776 |
|
777 |
reset_connection (); |
778 |
} |
779 |
|
780 |
void |
781 |
connection::rekey_cb (tstamp &ts) |
782 |
{ |
783 |
ts = TSTAMP_CANCEL; |
784 |
|
785 |
reset_connection (); |
786 |
establish_connection (); |
787 |
} |
788 |
|
789 |
void |
790 |
connection::send_data_packet (tap_packet * pkt, bool broadcast) |
791 |
{ |
792 |
vpndata_packet *p = new vpndata_packet; |
793 |
int tos = 0; |
794 |
|
795 |
if (conf->inherit_tos |
796 |
&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
797 |
&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
798 |
tos = (*pkt)[15] & IPTOS_TOS_MASK; |
799 |
|
800 |
p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
801 |
vpn->send_vpn_packet (p, &sa, tos); |
802 |
|
803 |
delete p; |
804 |
|
805 |
if (oseqno > MAX_SEQNO) |
806 |
rekey (); |
807 |
} |
808 |
|
809 |
void |
810 |
connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
811 |
{ |
812 |
if (ictx && octx) |
813 |
send_data_packet (pkt, broadcast); |
814 |
else |
815 |
{ |
816 |
if (!broadcast)//DDDD |
817 |
queue.put (new tap_packet (*pkt)); |
818 |
|
819 |
establish_connection (); |
820 |
} |
821 |
} |
822 |
|
823 |
void |
824 |
connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa) |
825 |
{ |
826 |
last_activity = NOW; |
827 |
|
828 |
slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
829 |
conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
830 |
|
831 |
switch (pkt->typ ()) |
832 |
{ |
833 |
case vpn_packet::PT_PING: |
834 |
send_ping (ssa, 1); // pong |
835 |
break; |
836 |
|
837 |
case vpn_packet::PT_PONG: |
838 |
// we send pings instead of auth packets after some retries, |
839 |
// so reset the retry counter and establish a conenction |
840 |
// when we receive a pong. |
841 |
if (!ictx && !octx) |
842 |
{ |
843 |
retry_cnt = 0; |
844 |
establish_connection.at = 0; |
845 |
establish_connection (); |
846 |
} |
847 |
|
848 |
break; |
849 |
|
850 |
case vpn_packet::PT_RESET: |
851 |
{ |
852 |
reset_connection (); |
853 |
|
854 |
config_packet *p = (config_packet *) pkt; |
855 |
if (!p->chk_config ()) |
856 |
{ |
857 |
slog (L_WARN, _("protocol mismatch, disabling node '%s'"), conf->nodename); |
858 |
connectmode = conf_node::C_DISABLED; |
859 |
} |
860 |
else if (connectmode == conf_node::C_ALWAYS) |
861 |
establish_connection (); |
862 |
} |
863 |
break; |
864 |
|
865 |
case vpn_packet::PT_AUTH: |
866 |
{ |
867 |
auth_packet *p = (auth_packet *) pkt; |
868 |
|
869 |
slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype); |
870 |
|
871 |
if (p->chk_config () |
872 |
&& !strncmp (p->magic, MAGIC, 8)) |
873 |
{ |
874 |
if (p->prot_minor != PROTOCOL_MINOR) |
875 |
slog (L_INFO, _("protocol minor version mismatch: ours is %d, %s's is %d."), |
876 |
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
877 |
|
878 |
if (p->subtype == AUTH_INIT) |
879 |
send_auth (AUTH_INITREPLY, ssa); |
880 |
|
881 |
const rsachallenge *k = rsa_cache.private_decrypt (::conf.rsa_key, p->challenge); |
882 |
|
883 |
if (!k) |
884 |
{ |
885 |
slog (L_ERR, _("challenge from %s (%s) illegal or corrupted"), |
886 |
conf->nodename, (const char *)sockinfo (ssa)); |
887 |
break; |
888 |
} |
889 |
|
890 |
retry_cnt = 0; |
891 |
establish_connection.set (NOW + 8); //? ;) |
892 |
keepalive.reset (); |
893 |
rekey.reset (); |
894 |
|
895 |
switch (p->subtype) |
896 |
{ |
897 |
case AUTH_INIT: |
898 |
case AUTH_INITREPLY: |
899 |
delete ictx; |
900 |
ictx = 0; |
901 |
|
902 |
delete octx; |
903 |
|
904 |
octx = new crypto_ctx (*k, 1); |
905 |
oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
906 |
|
907 |
send_auth (AUTH_REPLY, ssa, k); |
908 |
break; |
909 |
|
910 |
case AUTH_REPLY: |
911 |
|
912 |
if (!memcmp ((u8 *)gen_challenge (seqrand, ssa), (u8 *)k, sizeof (rsachallenge))) |
913 |
{ |
914 |
delete ictx; |
915 |
|
916 |
ictx = new crypto_ctx (*k, 0); |
917 |
iseqno.reset (ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
918 |
|
919 |
sa = *ssa; |
920 |
|
921 |
rekey.set (NOW + ::conf.rekey); |
922 |
keepalive.set (NOW + ::conf.keepalive); |
923 |
|
924 |
// send queued packets |
925 |
while (tap_packet *p = queue.get ()) |
926 |
{ |
927 |
send_data_packet (p); |
928 |
delete p; |
929 |
} |
930 |
|
931 |
connectmode = conf->connectmode; |
932 |
|
933 |
slog (L_INFO, _("connection to %d (%s %s) established"), |
934 |
conf->id, conf->nodename, (const char *)sockinfo (ssa)); |
935 |
|
936 |
if (::conf.script_node_up) |
937 |
run_script (this, &connection::script_node_up, false); |
938 |
} |
939 |
else |
940 |
slog (L_ERR, _("sent and received challenge do not match with (%s %s))"), |
941 |
conf->nodename, (const char *)sockinfo (ssa)); |
942 |
|
943 |
break; |
944 |
default: |
945 |
slog (L_ERR, _("authentification illegal subtype error (%s %s)"), |
946 |
conf->nodename, (const char *)sockinfo (ssa)); |
947 |
break; |
948 |
} |
949 |
} |
950 |
else |
951 |
send_reset (ssa); |
952 |
|
953 |
break; |
954 |
} |
955 |
|
956 |
case vpn_packet::PT_DATA_COMPRESSED: |
957 |
#if !ENABLE_COMPRESSION |
958 |
send_reset (ssa); |
959 |
break; |
960 |
#endif |
961 |
case vpn_packet::PT_DATA_UNCOMPRESSED: |
962 |
|
963 |
if (ictx && octx) |
964 |
{ |
965 |
vpndata_packet *p = (vpndata_packet *)pkt; |
966 |
|
967 |
if (*ssa == sa) |
968 |
{ |
969 |
if (!p->hmac_chk (ictx)) |
970 |
slog (L_ERR, _("hmac authentication error, received invalid packet\n" |
971 |
"could be an attack, or just corruption or an synchronization error")); |
972 |
else |
973 |
{ |
974 |
u32 seqno; |
975 |
tap_packet *d = p->unpack (this, seqno); |
976 |
|
977 |
if (iseqno.recv_ok (seqno)) |
978 |
{ |
979 |
vpn->tap->send (d); |
980 |
|
981 |
if (p->dst () == 0) // re-broadcast |
982 |
for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
983 |
{ |
984 |
connection *c = *i; |
985 |
|
986 |
if (c->conf != THISNODE && c->conf != conf) |
987 |
c->inject_data_packet (d); |
988 |
} |
989 |
|
990 |
delete d; |
991 |
|
992 |
break; |
993 |
} |
994 |
} |
995 |
} |
996 |
else |
997 |
slog (L_ERR, _("received data packet from unknown source %s"), (const char *)sockinfo (ssa));//D |
998 |
} |
999 |
|
1000 |
send_reset (ssa); |
1001 |
break; |
1002 |
|
1003 |
case vpn_packet::PT_CONNECT_REQ: |
1004 |
if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
1005 |
{ |
1006 |
connect_req_packet *p = (connect_req_packet *) pkt; |
1007 |
|
1008 |
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1009 |
|
1010 |
connection *c = vpn->conns[p->id - 1]; |
1011 |
|
1012 |
slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
1013 |
conf->id, p->id, c->ictx && c->octx); |
1014 |
|
1015 |
if (c->ictx && c->octx) |
1016 |
{ |
1017 |
// send connect_info packets to both sides, in case one is |
1018 |
// behind a nat firewall (or both ;) |
1019 |
{ |
1020 |
sockinfo si(sa); |
1021 |
|
1022 |
slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
1023 |
c->conf->id, conf->id, (const char *)si); |
1024 |
|
1025 |
connect_info_packet *r = new connect_info_packet (c->conf->id, conf->id, si); |
1026 |
|
1027 |
r->hmac_set (c->octx); |
1028 |
vpn->send_vpn_packet (r, &c->sa); |
1029 |
|
1030 |
delete r; |
1031 |
} |
1032 |
|
1033 |
{ |
1034 |
sockinfo si(c->sa); |
1035 |
|
1036 |
slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
1037 |
conf->id, c->conf->id, (const char *)si); |
1038 |
|
1039 |
connect_info_packet *r = new connect_info_packet (conf->id, c->conf->id, si); |
1040 |
|
1041 |
r->hmac_set (octx); |
1042 |
vpn->send_vpn_packet (r, &sa); |
1043 |
|
1044 |
delete r; |
1045 |
} |
1046 |
} |
1047 |
} |
1048 |
|
1049 |
break; |
1050 |
|
1051 |
case vpn_packet::PT_CONNECT_INFO: |
1052 |
if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
1053 |
{ |
1054 |
connect_info_packet *p = (connect_info_packet *) pkt; |
1055 |
|
1056 |
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1057 |
|
1058 |
connection *c = vpn->conns[p->id - 1]; |
1059 |
|
1060 |
slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1061 |
conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1062 |
|
1063 |
c->send_auth (AUTH_INIT, p->si.sa ()); |
1064 |
} |
1065 |
break; |
1066 |
|
1067 |
default: |
1068 |
send_reset (ssa); |
1069 |
break; |
1070 |
} |
1071 |
} |
1072 |
|
1073 |
void connection::keepalive_cb (tstamp &ts) |
1074 |
{ |
1075 |
if (NOW >= last_activity + ::conf.keepalive + 30) |
1076 |
{ |
1077 |
reset_connection (); |
1078 |
establish_connection (); |
1079 |
} |
1080 |
else if (NOW < last_activity + ::conf.keepalive) |
1081 |
ts = last_activity + ::conf.keepalive; |
1082 |
else if (conf->connectmode != conf_node::C_ONDEMAND |
1083 |
|| THISNODE->connectmode != conf_node::C_ONDEMAND) |
1084 |
{ |
1085 |
send_ping (&sa); |
1086 |
ts = NOW + 5; |
1087 |
} |
1088 |
else |
1089 |
reset_connection (); |
1090 |
|
1091 |
} |
1092 |
|
1093 |
void connection::connect_request (int id) |
1094 |
{ |
1095 |
connect_req_packet *p = new connect_req_packet (conf->id, id); |
1096 |
|
1097 |
slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id); |
1098 |
p->hmac_set (octx); |
1099 |
vpn->send_vpn_packet (p, &sa); |
1100 |
|
1101 |
delete p; |
1102 |
} |
1103 |
|
1104 |
void connection::script_node () |
1105 |
{ |
1106 |
vpn->script_if_up (); |
1107 |
|
1108 |
char *env; |
1109 |
asprintf (&env, "DESTID=%d", conf->id); |
1110 |
putenv (env); |
1111 |
asprintf (&env, "DESTNODE=%s", conf->nodename); |
1112 |
putenv (env); |
1113 |
asprintf (&env, "DESTIP=%s", inet_ntoa (sa.sin_addr)); |
1114 |
putenv (env); |
1115 |
asprintf (&env, "DESTPORT=%d", ntohs (sa.sin_port)); |
1116 |
putenv (env); |
1117 |
} |
1118 |
|
1119 |
const char *connection::script_node_up () |
1120 |
{ |
1121 |
script_node (); |
1122 |
|
1123 |
putenv ("STATE=up"); |
1124 |
|
1125 |
return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1126 |
} |
1127 |
|
1128 |
const char *connection::script_node_down () |
1129 |
{ |
1130 |
script_node (); |
1131 |
|
1132 |
putenv ("STATE=down"); |
1133 |
|
1134 |
return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1135 |
} |
1136 |
|
1137 |
connection::connection(struct vpn *vpn_) |
1138 |
: vpn(vpn_) |
1139 |
, rekey (this, &connection::rekey_cb) |
1140 |
, keepalive (this, &connection::keepalive_cb) |
1141 |
, establish_connection (this, &connection::establish_connection_cb) |
1142 |
{ |
1143 |
octx = ictx = 0; |
1144 |
retry_cnt = 0; |
1145 |
|
1146 |
connectmode = conf_node::C_ALWAYS; // initial setting |
1147 |
reset_connection (); |
1148 |
} |
1149 |
|
1150 |
connection::~connection () |
1151 |
{ |
1152 |
shutdown (); |
1153 |
} |
1154 |
|
1155 |
///////////////////////////////////////////////////////////////////////////// |
1156 |
|
1157 |
const char *vpn::script_if_up () |
1158 |
{ |
1159 |
// the tunnel device mtu should be the physical mtu - overhead |
1160 |
// the tricky part is rounding to the cipher key blocksize |
1161 |
int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD; |
1162 |
mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
1163 |
mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
1164 |
mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
1165 |
|
1166 |
char *env; |
1167 |
asprintf (&env, "CONFBASE=%s", confbase); |
1168 |
putenv (env); |
1169 |
asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
1170 |
putenv (env); |
1171 |
asprintf (&env, "NODEID=%d", THISNODE->id); |
1172 |
putenv (env); |
1173 |
asprintf (&env, "IFNAME=%s", tap->interface ()); |
1174 |
putenv (env); |
1175 |
asprintf (&env, "MTU=%d", mtu); |
1176 |
putenv (env); |
1177 |
asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
1178 |
0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
1179 |
THISNODE->id & 0xff); |
1180 |
putenv (env); |
1181 |
|
1182 |
return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
1183 |
} |
1184 |
|
1185 |
int |
1186 |
vpn::setup (void) |
1187 |
{ |
1188 |
struct sockaddr_in sa; |
1189 |
|
1190 |
socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
1191 |
if (socket_fd < 0) |
1192 |
return -1; |
1193 |
|
1194 |
fill_sa (&sa, THISNODE); |
1195 |
|
1196 |
if (bind (socket_fd, (sockaddr *)&sa, sizeof (sa))) |
1197 |
{ |
1198 |
slog (L_ERR, _("can't bind to %s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
1199 |
exit (1); |
1200 |
} |
1201 |
|
1202 |
#ifdef IP_MTU_DISCOVER |
1203 |
// this I really consider a linux bug. I am neither connected |
1204 |
// nor do I fragment myself. Linux still sets DF and doesn't |
1205 |
// fragment for me sometimes. |
1206 |
{ |
1207 |
int oval = IP_PMTUDISC_DONT; |
1208 |
setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
1209 |
} |
1210 |
#endif |
1211 |
{ |
1212 |
int oval = 1; |
1213 |
setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
1214 |
} |
1215 |
|
1216 |
udp_ev_watcher.start (socket_fd, POLLIN); |
1217 |
|
1218 |
tap = new tap_device (); |
1219 |
if (!tap) //D this, of course, never catches |
1220 |
{ |
1221 |
slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
1222 |
exit (1); |
1223 |
} |
1224 |
|
1225 |
run_script (this, &vpn::script_if_up, true); |
1226 |
|
1227 |
vpn_ev_watcher.start (tap->fd, POLLIN); |
1228 |
|
1229 |
reconnect_all (); |
1230 |
|
1231 |
return 0; |
1232 |
} |
1233 |
|
1234 |
void |
1235 |
vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos) |
1236 |
{ |
1237 |
setsockopt (socket_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
1238 |
sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa)); |
1239 |
} |
1240 |
|
1241 |
void |
1242 |
vpn::shutdown_all () |
1243 |
{ |
1244 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1245 |
(*c)->shutdown (); |
1246 |
} |
1247 |
|
1248 |
void |
1249 |
vpn::reconnect_all () |
1250 |
{ |
1251 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1252 |
delete *c; |
1253 |
|
1254 |
conns.clear (); |
1255 |
|
1256 |
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
1257 |
i != conf.nodes.end (); ++i) |
1258 |
{ |
1259 |
connection *conn = new connection (this); |
1260 |
|
1261 |
conn->conf = *i; |
1262 |
conns.push_back (conn); |
1263 |
|
1264 |
conn->establish_connection (); |
1265 |
} |
1266 |
} |
1267 |
|
1268 |
connection *vpn::find_router () |
1269 |
{ |
1270 |
u32 prio = 0; |
1271 |
connection *router = 0; |
1272 |
|
1273 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
1274 |
{ |
1275 |
connection *c = *i; |
1276 |
|
1277 |
if (c->conf->routerprio > prio |
1278 |
&& c->connectmode == conf_node::C_ALWAYS |
1279 |
&& c->conf != THISNODE |
1280 |
&& c->ictx && c->octx) |
1281 |
{ |
1282 |
prio = c->conf->routerprio; |
1283 |
router = c; |
1284 |
} |
1285 |
} |
1286 |
|
1287 |
return router; |
1288 |
} |
1289 |
|
1290 |
void vpn::connect_request (int id) |
1291 |
{ |
1292 |
connection *c = find_router (); |
1293 |
|
1294 |
if (c) |
1295 |
c->connect_request (id); |
1296 |
//else // does not work, because all others must connect to the same router |
1297 |
// // no router found, aggressively connect to all routers |
1298 |
// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
1299 |
// if ((*i)->conf->routerprio) |
1300 |
// (*i)->establish_connection (); |
1301 |
} |
1302 |
|
1303 |
void |
1304 |
vpn::udp_ev (short revents) |
1305 |
{ |
1306 |
if (revents & (POLLIN | POLLERR)) |
1307 |
{ |
1308 |
vpn_packet *pkt = new vpn_packet; |
1309 |
struct sockaddr_in sa; |
1310 |
socklen_t sa_len = sizeof (sa); |
1311 |
int len; |
1312 |
|
1313 |
len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
1314 |
|
1315 |
if (len > 0) |
1316 |
{ |
1317 |
pkt->len = len; |
1318 |
|
1319 |
unsigned int src = pkt->src (); |
1320 |
unsigned int dst = pkt->dst (); |
1321 |
|
1322 |
slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
1323 |
(const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
1324 |
|
1325 |
if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX) |
1326 |
slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"), |
1327 |
pkt->typ (), pkt->src (), pkt->dst ()); |
1328 |
else if (dst == 0 && !THISNODE->routerprio) |
1329 |
slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst); |
1330 |
else if (dst != 0 && dst != THISNODE->id) |
1331 |
slog (L_WARN, |
1332 |
_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
1333 |
dst, conns[dst - 1]->conf->nodename, |
1334 |
(const char *)sockinfo (sa), |
1335 |
THISNODE->id, THISNODE->nodename); |
1336 |
else if (src == 0 || src > conns.size ()) |
1337 |
slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa)); |
1338 |
else |
1339 |
conns[src - 1]->recv_vpn_packet (pkt, &sa); |
1340 |
} |
1341 |
else |
1342 |
{ |
1343 |
// probably ECONNRESET or somesuch |
1344 |
slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
1345 |
} |
1346 |
|
1347 |
delete pkt; |
1348 |
} |
1349 |
else if (revents & POLLHUP) |
1350 |
{ |
1351 |
// this cannot ;) happen on udp sockets |
1352 |
slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating.")); |
1353 |
exit (1); |
1354 |
} |
1355 |
else |
1356 |
{ |
1357 |
slog (L_ERR, |
1358 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
1359 |
revents); |
1360 |
exit (1); |
1361 |
} |
1362 |
} |
1363 |
|
1364 |
void |
1365 |
vpn::vpn_ev (short revents) |
1366 |
{ |
1367 |
if (revents & POLLIN) |
1368 |
{ |
1369 |
/* process data */ |
1370 |
tap_packet *pkt; |
1371 |
|
1372 |
pkt = tap->recv (); |
1373 |
|
1374 |
int dst = mac2id (pkt->dst); |
1375 |
int src = mac2id (pkt->src); |
1376 |
|
1377 |
if (src != THISNODE->id) |
1378 |
{ |
1379 |
slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
1380 |
exit (1); |
1381 |
} |
1382 |
|
1383 |
if (dst == THISNODE->id) |
1384 |
{ |
1385 |
slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
1386 |
exit (1); |
1387 |
} |
1388 |
|
1389 |
if (dst > conns.size ()) |
1390 |
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
1391 |
else |
1392 |
{ |
1393 |
if (dst) |
1394 |
{ |
1395 |
// unicast |
1396 |
if (dst != THISNODE->id) |
1397 |
conns[dst - 1]->inject_data_packet (pkt); |
1398 |
} |
1399 |
else |
1400 |
{ |
1401 |
// broadcast, first check router, then self, then english |
1402 |
connection *router = find_router (); |
1403 |
|
1404 |
if (router) |
1405 |
router->inject_data_packet (pkt, true); |
1406 |
else |
1407 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1408 |
if ((*c)->conf != THISNODE) |
1409 |
(*c)->inject_data_packet (pkt); |
1410 |
} |
1411 |
} |
1412 |
|
1413 |
delete pkt; |
1414 |
} |
1415 |
else if (revents & (POLLHUP | POLLERR)) |
1416 |
{ |
1417 |
slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
1418 |
exit (1); |
1419 |
} |
1420 |
else |
1421 |
abort (); |
1422 |
} |
1423 |
|
1424 |
void |
1425 |
vpn::event_cb (tstamp &ts) |
1426 |
{ |
1427 |
if (events) |
1428 |
{ |
1429 |
if (events & EVENT_SHUTDOWN) |
1430 |
{ |
1431 |
shutdown_all (); |
1432 |
|
1433 |
remove_pid (pidfilename); |
1434 |
|
1435 |
slog (L_INFO, _("vped terminating")); |
1436 |
|
1437 |
exit (0); |
1438 |
} |
1439 |
|
1440 |
if (events & EVENT_RECONNECT) |
1441 |
reconnect_all (); |
1442 |
|
1443 |
events = 0; |
1444 |
} |
1445 |
|
1446 |
ts = TSTAMP_CANCEL; |
1447 |
} |
1448 |
|
1449 |
vpn::vpn (void) |
1450 |
: udp_ev_watcher (this, &vpn::udp_ev) |
1451 |
, vpn_ev_watcher (this, &vpn::vpn_ev) |
1452 |
, event (this, &vpn::event_cb) |
1453 |
{ |
1454 |
} |
1455 |
|
1456 |
vpn::~vpn () |
1457 |
{ |
1458 |
} |
1459 |
|